Pt primary voltage reconstruction method based on inverse black box model and inverse electromagnetic duality model

A device for reconstructing a primary voltage of a potential transformer (PT) based on an inverse black box model and an inverse electromagnetic duality model, comprising:

• a frequency component extraction module, a high-frequency back calculation module, a low-frequency back calculation module, and an integration module,
• wherein the frequency component extraction module is configured to collect a secondary voltage signal of a power system by the PT, and dividing the secondary voltage signal into a low-frequency voltage component and a high-frequency voltage component;
• the high-frequency back calculation module is configured to perform primary voltage reconstruction by applying the inverse black box model on the high-frequency voltage component, to obtain a primary-voltage high-frequency voltage component;
• the low-frequency back calculation module is configured to perform primary voltage reconstruction by applying the inverse electromagnetic duality model on the low-frequency voltage component, to obtain a primary-voltage low-frequency voltage component;
• and
• the integration module is configured to integrate the primary-voltage high-frequency voltage component and the primary-voltage low-frequency voltage component, to obtain the primary voltage of the power system.